JPH0823227B2 - Wire sawing equipment for reinforced concrete structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire sawing device for buildings, bridges, foundations and other reinforced concrete structures.

[0002]

2. Description of the Related Art Disc blade cutters have been widely used for partial disassembly of reinforced concrete structures, but they have been reduced in size and weight because of blade manufacturing, workability, and handling. Therefore, the cutting ability is poor, the cutting cross-sectional area is limited to a narrow range, and the maximum cutting depth is about 30 to 40 cm. Further, in the case of such a partially disassembled body by the rotation of the disk blade, there is a problem that an overcut is required even at a cutting unnecessary portion.

In order to solve these problems all at once, the present invention has recently developed an apparatus for cutting and dismantling a reinforced concrete structure by wire sawing. This device hangs a cutting cable, which is a wire rope with cutting ability, on a reinforced concrete structure and circulates the cutting cable in a direction away from the front of the reinforced concrete structure by a cable drive device while adjusting the traveling speed and tension. It is what makes me.

In this case, the cutting cable usually has a structure in which beads having a diamond abrasive grain layer are arranged in a wire lobe at an appropriate pitch, with or without a spacer such as a coil spring. In addition, the cable drive device has, for example, a structure including a drive pulley around which a cutting cable is wound, a hydraulic motor or an electric motor for rotating the cable drive pulley, and other accessory mechanisms, and is arranged along a track. Those which are moved by means of a drive wheel, specifically those which move on rails by drive wheels and those which move on a rack by drive pinions are appropriately used.

[0005]

[Problems to be Solved by the Invention] When wire sawing a reinforced concrete structure, the cutting cable is
In general, from the early stage to the middle stage of cutting, it bends relatively gently, that is, runs smoothly with a large radius of curvature, and cuts not only the concrete layer in contact but also the reinforcing bar without any trouble. However, when the diameter of the uncut portion or the cross-sectional area becomes small at the end of cutting, the cutting cable also runs with a small sharp bend in the portion in contact with the uncut portion. The metal fatigue of the rope progresses, and the beads and spacers that cannot be bent together with the wire rope, especially when hooked with the reinforcing bar, hinder the running of the cable for cutting, abnormal load is applied to the wire rope, the wire rope breaks and the spacer There was a problem that damage such as is likely to occur. Then, if the wire rope of the cutting cable breaks during wire sawing of the reinforced concrete structure, it is necessary to repair the connection at the broken part, replace it with a new cutting cable, or re-install the cutting cable. Since the wire sawing is interrupted, the productivity is greatly reduced, and the broken cutting cable bounces away from the reinforced concrete structure, causing a danger to the surroundings.

Further, the cutting cable has a problem in that even if there is no breakage accident during the wire sawing, the cutting cable jumps away from the reinforced concrete structure at the same time as the end of cutting, causing a danger to the surroundings. .

Further, since this device circulates the cutting cable in a direction away from the front surface of the reinforced concrete structure by the cable drive device while adjusting the traveling speed and tension, the cable drive device is installed on the front surface of the reinforced concrete structure. It was necessary to have a space for disposing it and moving it away from the front surface of the reinforced concrete structure.

It is an object of the present invention, in the wire sawing of a reinforced concrete structure, at the end of cutting, the running cutting cable does not form the above-mentioned small and sharp bend leading to the break, and further cutting is completed. At times, it is to provide a wire sawing device in which a cutting cable separated from a reinforced concrete structure does not bounce around.

Another object of the present invention is to arrange the cable drive in a narrow space along the surface of the reinforced concrete structure, which does not require a large space in front of the reinforced concrete structure and which can be installed along the surface of the reinforced concrete structure. It is to provide a wire sawing device that has enough space for moving and cutting.

[0010]

A wire sawing device for a reinforced concrete structure according to the present invention comprises a pair of guide pulleys installed on the same plane as the planned cutting surface along the surface of the reinforced concrete structure, and a cutting cable,
A cable drive device that hangs on the reinforced concrete structure from the outside of one guide pulley and is pulled out from the inside of the other guide pulley to make the cutting cable circulate and run endlessly under the control of tension and running speed. Is.

Further, the above wire sawing device is
In order to allow various arrangements of cutting cables, a pair of guide pulleys should be provided along the surface of the reinforced concrete structure, flush with the planned cutting surface, and the tangent line passing through each guide pulley and pulley groove should be common. Install the auxiliary guide pulley adjacent to each guide pulley,
Pass the cutting cable through one of the auxiliary guide pulleys,
The reinforced concrete structure is hung from the outside of the guide pulley adjacent to it, passed through the inside of the other guide pulley, and is arranged so as to be pulled out from the auxiliary guide pulley adjacent to it, and the cutting cable is endless under the adjustment of tension and traveling speed. The configuration can be partially changed to a configuration including a cable drive device that is circulated in the state.

The winding of the cable around the guide pulley in the wire sawing device according to the present invention may be adopted from the initial stage of cutting as described above. It may be adopted from the middle stage or the end stage.

[0013]

The present invention will be described below with reference to the embodiments shown in the drawings.

1 and 2 which are a plan view and a side view illustrating a wire sawing device for a reinforced concrete structure according to the present invention, a quadrangular prismatic reinforced concrete structure 2 which is a non-cut body is vertically hung on a road surface 1. The reinforced concrete structure 2 is configured by arranging reinforcing bars 4 in a concrete layer 3 in an axial direction.

A guide pulley base 5 is fixed to the surface of the reinforced concrete structure 2 by an anchor 6, and the guide pulley base 5 is adjacent to the pair of horizontally oriented guide pulleys 7a and 7b and the guide pulleys 7a and 7b. , A pair of vertically oriented auxiliary guide pulleys 8a and 8b having a common tangent line passing through the pulley grooves are rotatably mounted. The guide pulley 7a,
7b and the auxiliary guide pulleys 8a and 8b are convenient for handling and installation if they are integrated by the guide pulley base 5 as described above, but they may be installed individually, and the reinforced concrete structure may also be used. It may be installed on a fixed object other than 2, for example, the road surface 1.

On the other hand, on the road surface 1, a second guide pulley base 9 is fixed by an anchor 10 at a distance from the reinforced concrete structure 2 and further adjacent thereto, the rail 1
1 is laid. On the second guide pulley base 9, vertically oriented loose side guide pulleys 12 and 13 and a tension side guide pulley 14 are rotatably mounted, and a cable drive device 15 is movably installed on the rail 11. There is. The cable drive device 15 includes a cable drive pulley 16 and a drive mechanism thereof (not shown), a drive wheel 17 fitted to the rail 11 and a drive mechanism thereof (not shown).

As shown by the broken line in the drawing, the cutting cable 18 is hung on the cable drive pulley 16 and starts from its slack side, and the slack side guide pulley 12,
Auxiliary guide pulley 8a passing through one auxiliary guide pulley 8a, wound around the reinforced concrete structure 2 from the outside of the adjacent guide pulley 7a, passing through the inside of the other guide pulley, and adjacent to the auxiliary guide pulley 8b.
It is pulled out from the end and is arranged in an endless state so as to return to the tension side of the cable drive pulley 16 via the tension side guide pulley 14.

When it is necessary to cut only a predetermined section of the reinforced concrete structure 2 when, for example, partially cutting or forming an opening, the cutting cable 18 is used.
Instead of being wrapped around the entire circumference of the reinforced concrete structure 2, it may be hung so as to pass through one or two perforations (not shown) that penetrate the reinforced concrete structure 2.

In the above, when the cable drive device 15 is operated and the cable drive pulley 16 is rotationally driven while urging the cable drive device 15 along the rail 11 so as to be movable in the right direction in the drawing, the cutting cable 18 has the required tension. The reinforced concrete structure 2 that circulates downwards and comes into frictional contact with it is gradually cut from its surface to the inside.

The guide pulleys 7a and 7b are oriented horizontally in the case of horizontal cutting as described above, but the same is true in the case of slant cutting or vertical cutting, and they are installed on the same plane as the planned cutting surface. It Further, the guide pulleys 7a, 7b
The installation angle of the auxiliary guide pulleys 8a, 8b with respect to
In the above case, it is a right angle, but the cable drive pulley 16
An angle other than a right angle may be adopted depending on the arrangement of the cutting cable 18 in the above. Guide pulley 7a, 7
Since the auxiliary guide pulleys 8a and 8b corresponding to b have a common tangent line passing through the pulley groove, the cutting cable 18
Can smoothly bridge between the guide pulleys 7a, 7b and the corresponding auxiliary guide pulleys 8a, 8b along the tangent line thereof so as to allow traveling.

The auxiliary guide pulleys 8a and 8b, the loose guide guide pulleys 12 and 13, the tension guide pulley 14 and the like include an endless cutting cable 18 hung at an upper cutting point in the reinforced concrete structure 2.
Cable drive pulley 16 of the upper cable drive device 15
Up to this, it is useful for guiding the vehicle smoothly and smoothly.
Therefore, depending on the positional relationship between the cutting point and the cable driving pulley 16, they are not necessary, or guide pulleys of another mode are installed on the road surface 1, the reinforced concrete structure 2, the cable driving device 15, and the like. For example, when the cutting point is below the cable drive device 15, for example, when the root part of the reinforced concrete structure 2 underwater is wire sawed by the cable drive device 15 installed on land, the auxiliary guide pulleys 8a and 8b are used. Can be installed above the guide pulleys 7a and 7b to guide the cutting cable 18 upward.

As the cutting progresses, the contact portion of the cutting cable 18 with the reinforced concrete structure is
While traveling while bending, the bent portion gradually moves in the direction of the guide pulleys 7a and 7b, but as described above, the cutting cable 18 is provided from the outside of the one guide pulley 7a through the reinforced concrete structure 2 and the other. Since the guide pulley 7b is disposed inside the guide pulley 7b, the distance between the tight side and the loose side of the cutting cable 18 hung on the uncut portion of the reinforced concrete structure 2 is one guide even at the end of cutting. Since the distance between the outer side of the pulley 7a and the inner side of the other guide pulley 7b does not become narrower, the bending of the contact portion does not become extremely small or sharp, as shown by the one-dot chain line in the drawing. The breakage of the cutting cable 18 is unlikely to occur.

When the cutting is completed, the cutting cable 1
Even if 8 is separated from the reinforced concrete structure 2, the cutting cable 18 is hooked on one of the guide pulleys 7a and stopped, so that no dangerous splashing occurs.

It is preferable to install the guide pulleys 7a and 7b so that the distance between the tight side and the loose side of the cutting cable 18 is appropriately wide. Further, the cutting cable 18 is fixed to both guide pulleys 7a. It is natural that the same operation as described above can be achieved by hanging it on the outer side of 7b.

Incidentally, comparing the wire sawing device of the above-mentioned embodiment with another wire sawing device, in FIG. 3 which is a plan view of another wire sawing device of a reinforced concrete structure, a pair of reinforced concrete structures 2 along the surface of the columnar reinforced concrete structure 2 Guide pulleys 7c and 7d are horizontally arranged, and the cutting cable 18 is hung on the reinforced concrete structure 2 through the inside of one guide pulley 7c and the other of the guide pulleys 7d as shown by a broken line in the drawing. Although not shown in the drawing, it is drawn out from the inner side, and is disposed so as to be able to circulate in an endless state as in the case of the above embodiment.

In this case as well, the cutting cable 18 runs with a relatively large bend in the initial and middle stages of cutting, but there is no problem, but at the end of cutting, as shown by the chain double-dashed line in the drawing, the bending Becomes small and sharp, and it will run unstable with almost bending.

[0027]

As a result, in the wire sawing device for a reinforced concrete structure according to the present invention, the cutting cable is hung on the reinforced concrete structure from the outside of one of the guide pulleys, and the uncut portion of the reinforced concrete structure is reached even at the end of cutting. The distance between the tension side and the slack side of the cutting cable that is hung on does not become narrower than the distance between the outside of one guide pulley and the inside of the other guide pulley.Therefore, at the end of cutting during wire sawing of reinforced concrete structures. The running cutting cable does not form a small sharp bend or bend leading to the break, and breakage due to metal fatigue of the wire rope or damage to the spacer or the like is prevented.

Further, in this wire sawing device,
Since the cutting cable is hung from the outside of one guide pulley to the reinforced concrete structure, even after the cutting cable is separated from the reinforced concrete structure at the end of the cutting, the cutting cable is stopped by the guide pulley and thus jumps off. Does not affect the surrounding area.

Further, in this wire sawing apparatus, if auxiliary guide pulleys are installed adjacent to the respective guide pulleys, the cutting cable can be smoothly guided from the respective guide pulleys in a desired direction, so that various arrangements are possible. It will be possible.

Since a pair of guide pulleys are installed along the surface of the reinforced concrete structure on the same plane as the planned cutting surface and the cable drive device is moved along the surface of the reinforced concrete structure, even when there is no space in front of the reinforced concrete structure. Cutting work can be done in a narrow space along the surface of reinforced concrete structures.

[Brief description of drawings]

FIG. 1 is a plan view illustrating a wire sawing device for a reinforced concrete structure according to the present invention.

FIG. 2 is a side view illustrating a wire sawing device for a reinforced concrete structure according to the present invention.

FIG. 3 is a plan view of another wire sawing device for a reinforced concrete structure.

[Explanation of symbols]

 2 Reinforced concrete structure 7a Guide pulley 7b Guide pulley 8a Auxiliary guide pulley 8b Auxiliary guide pulley 15 Cable drive device 18 Cutting cable

Claims (3)

[Claims] 1. A pair of guide pulleys are installed along the surface of a reinforced concrete structure on the same plane as the planned cutting surface, and a cutting cable is hung from the outside of one guide pulley to the reinforced concrete structure and inside of the other guide pulley. A wire sawing device for a reinforced concrete structure, which is arranged so as to be pulled out from a cable and drives a cutting cable to endlessly circulate under controlled tension and traveling speed. 2. A pair of guide pulleys are provided along the surface of the reinforced concrete structure in the same plane as the planned cutting surface.
Also, install auxiliary guide pulleys that have the same tangent line passing through each guide pulley and pulley groove adjacent to each guide pulley, pass the cutting cable through one auxiliary guide pulley, and from the outside of the adjacent guide pulley. A cable drive device that hangs on a reinforced concrete structure, passes through the inside of the other guide pulley, and is arranged so as to be pulled out from an auxiliary guide pulley adjacent to it, and allows the cutting cable to circulate in an endless state while adjusting tension and running speed Wire sawing equipment for reinforced concrete structures. 3. The wire sawing device for a reinforced concrete structure according to claim 2, wherein each auxiliary guide pulley is oriented at right angles to an adjacent guide pulley.